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Small size and performance improvement in pcacheManageDirtyList() by not

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zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects
that are not on the dirty list.

FossilOrigin-Name: 919863b14859d958d6c078097faae02070c7bd082e2814cf3f84bd84921e4419
This commit is contained in:
drh 2017-09-01 12:18:41 +00:00
parent 38688b0b1d
commit f0dae6d0a2
4 changed files with 11 additions and 12 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Clarify\sthe\sdocumentation\sabout\s"protected"\sversus\s"unprotected"\ssqlite3_value\nobjects.\s\sNo\schanges\sto\scode.
D 2017-08-31T21:11:52.089
C Small\ssize\sand\sperformance\simprovement\sin\spcacheManageDirtyList()\sby\snot\nzeroing\sthe\sPgHdr.pDirtyNext\sand\sPgHdr.pDirtyPrev\spointers\sfor\sPgHdr\sobjects\nthat\sare\snot\son\sthe\sdirty\slist.
D 2017-09-01T12:18:41.125
F Makefile.in c644bbe8ebe4aae82ad6783eae6b6beea4c727b99ff97568b847ced5e2ac7afb
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc 25b154da7f0b3d4924f27378c1f8d006285b80811f1ccf3ed953dbebf6282136
@ -446,8 +446,8 @@ F src/os_win.h 7b073010f1451abe501be30d12f6bc599824944a
F src/pager.c bf51378c57c8e05d7f4d7bb9861f403a2e40cde82e25513401216d1ed30bc3e5
F src/pager.h f2a99646c5533ffe11afa43e9e0bea74054e4efa
F src/parse.y 52ef3cecd0934e9da4a45b585883a03243ad615d338ad94f44501a05891dcdfa
F src/pcache.c 62835bed959e2914edd26afadfecce29ece0e870
F src/pcache.h 521bb9610d38ef17a3cc9b5ddafd4546c2ea67fa3d0e464823d73c2a28d50e11
F src/pcache.c f79181979fe7954b7bb4ef6c9689eabaa6733ed7393b25a4f77e15d11362b29d
F src/pcache.h 072f94d29281cffd99e46c1539849f248c4b56ae7684c1f36626797fee375170
F src/pcache1.c 716975564c15eb6679e97f734cec1bfd6c16ac3d4010f05f1f8e509fc7d19880
F src/pragma.c a4e5028dfc8af4c5c347cd0e91bd2f0c0f81fcd9b2c6e0acf8da7da51df7f1fe
F src/pragma.h bb83728944b42f6d409c77f5838a8edbdb0fe83046c5496ffc9602b40340a324
@ -1651,7 +1651,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P bcc20be5b290c563183e82a590cc1fdabadfb13475fd8f6b3d810365cea5d868
R d2d3bdf1e274f5eba4292da390f3324b
P 4094a3410e05597d0adc740d161e0358a3041c5a4e73bde35b1e983594c6879a
R 5aa7325d41fae70be10866bcc032aad5
U drh
Z c0deaaf09b7cbc0b0d0b890200390003
Z 3a2ed42dc8bf752f068ef19d1afbebba

2
manifest.uuid
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@ -1 +1 @@
4094a3410e05597d0adc740d161e0358a3041c5a4e73bde35b1e983594c6879a
919863b14859d958d6c078097faae02070c7bd082e2814cf3f84bd84921e4419

5
src/pcache.c
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@ -191,12 +191,9 @@ static void pcacheManageDirtyList(PgHdr *pPage, u8 addRemove){
p->eCreate = 2;
}
}
pPage->pDirtyNext = 0;
pPage->pDirtyPrev = 0;
}
if( addRemove & PCACHE_DIRTYLIST_ADD ){
assert( pPage->pDirtyNext==0 && pPage->pDirtyPrev==0 && p->pDirty!=pPage );
pPage->pDirtyPrev = 0;
pPage->pDirtyNext = p->pDirty;
if( pPage->pDirtyNext ){
assert( pPage->pDirtyNext->pDirtyPrev==0 );

2
src/pcache.h
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@ -43,6 +43,8 @@ struct PgHdr {
i16 nRef; /* Number of users of this page */
PgHdr *pDirtyNext; /* Next element in list of dirty pages */
PgHdr *pDirtyPrev; /* Previous element in list of dirty pages */
/* NB: pDirtyNext and pDirtyPrev are undefined if the
** PgHdr object is not dirty */
};
/* Bit values for PgHdr.flags */